When you tune your radio, watch TV, send a text message, or pop popcorn in a microwave oven, you are using electromagnetic energy. You depend on this energy every hour of every day.


Electromagnetic Radiation is also what we called the Electromagnetic Energy or Electromagnetic Spectrum. It travels in waves and spans a broad spectrum from very long radiowaves to very short gamma rays. However, the human eye can only able to detect a wee portion of the spectrums, known as the ‘Visible Light’.

When you tune your radio, watch a TV, send a text message, or pop a popcorn in a microwave oven, you are utilizing the electromagnetic energy for your daily activities. You depend on it every single day, every minute every hour. 

On a physics point of explanation, Eleectromagnetic radiation is the flow of energy at the universal speed of light through free space or through a material medium in the form of electric and magnetic fields that make up the electromagnetic waves, such as radiowaves, visible light, and gamma rays. 

The spectrum of frequencies of electromagnetic radiation extends from very low values over the range of radio waves, television waves, and microwavesto visible light and beyond to the substantially higher values of UV light , X-rays and gamma rays, 


Your radio captures radio waves emitted by radio stations, bringing your favorite tunes. Radio waves are also emitted by stars and gases in space.


Microwave radiation will cook your popcorn in just a few minutes, but is also used by astronomers to learn about the structure of nearby galaxies.


Night vision goggles pick up the infrared light emitted by our skin and objects with heat. In space, infrared light helps us map the dust between stars.

Visible Light

Our eyes detect visible light. Fireflies, light bulbs, and stars all emit visible light.


Ultraviolet radiation is emitted by the Sun and are the reason skin tans and burns. “Hot” objects in space emit UV radiation as well.


A dentist uses X-rays to image your teeth, and airport security uses them to see through your bag. Hot gases in the Universe also emit X-rays.

Gamma Ray

Doctors use gamma-ray imaging to see inside your body. The biggest gamma-ray generator of all is the Universe.

Natural Radiation Vs. Man-made Radiation.

Natural Radiation
  • Cosmic Radiation
    – The sun and stars send a constant stream of cosmic radiation to Earth, much like a steady drizzle of rain. Differences in elevation, atmospheric conditions, and the Earth’s magnetic field can change the amount (or dose) of cosmic radiation that we receive.
  • Terrestrial Radiation
    – The Earth itself is a source of terrestrial radiation. Radioactive materials (including uranium, thorium, and radium) exist naturally in soil and rock. Essentially all air contains radon , which is responsible for most of the dose that Americans receive each year from natural background sources. In addition, water contains small amounts of dissolved uranium and thorium, and all organic matter (both plant and animal) contains radioactive carbon and potassium. Some of these materials are ingested with food and water, while others (such as radon) are inhaled. The dose from terrestrial sources varies in different parts of the world, but locations with higher soil concentrations of uranium and thorium generally have higher doses.
  • Internal Radiation
    – All people have internal radiation, mainly from radioactive potassium-40 and carbon-14 inside their bodies from birth and, therefore, are sources of exposure to others. The variation in dose from one person to another is not as great as that associated with cosmic and terrestrial sources.
Man-made radiation
  • Tobacco
  • Televisions
  • Medical X-Rays
  • Smoke detectors
  • Lantern mantles
  • Nuclear medicine
  • Building materials
  • Combustible Fuel 
  • Opthalmic Glass 
  • Luminous Watch
  • Dials
  • Road construction material
  • Electron tubes
  • Fluorescent Lamp Straters

Low doses of radiation over long periods of time can produce chronic effects. Over the long run, it can damage and alter the genetic code (which also known as Gene Mutations). This damages can happen in gametes cells and somatic cells. For your information, Gametes cells are reproductive cells, an the other side, somatic cells are non -reproductive cells, where it can cause cancer by somatic cells mutation.


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